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| American Council for an Energy-Efficient Economy (ACEEE) | www.aceee.org/index.htm |
| Association of Energy Engineers (AEE) | www.aeecenter.org |
| Energy Foundation | www.ef.org |
| ENERGY guide | www.energyguide.com/energy/default.asp |
| Natural Resources Defense Council (NRDC) | www.nrdc.org |
| US Department of Energy (DOE) | www.energy.gov |
| Energy Efficiency and Renewable Energy Network (EREN) | www.eren.doe.gov |
| US Energy Information Administration (EIA) | www.eia.doe.gov |
| US Environmental Protection Agency (EPA) | www.epa.gov |
| Epact | www.energy.gov/taxbreaks |
